I learned something about this mood from a retired Foreign Service veteran. On October 27, 1962, he was sitting in the next room, listening on an intercom with second-echelon State Department officials while President Kennedy and his advisers discussed the appropriate response to Russian missiles in Cuba. As we now know, Kennedy barely held off an almost unanimous recommendation to bomb. What my informant vividly recalled was the mood of decision. They all recognized that a nuclear war would be a catastrophe of unimaginable dimensions; but at a certain point, the momentum seemed irresistible. “I thought to myself,” he said, “OK, let’s just do this.”